DS deadlock when memberof scopes topology plugin updates
    
    Topology plugin may merge (aka DEL) segments that would trigger
    internal search for groups owning that segment. The problem
    is that it is searching those groups into the full suffix and
    so need the schema compat map lock.
    
    If any other operation holding schema compat map lock need to
    access the page involved in the DEL, there is a deadlock.
    
    This fix is to prevent useless group searching if the target entry
    is a segment or is in compat tree.
    
    https://fedorahosted.org/freeipa/ticket/5637
    
    Reviewed-By: Martin Basti <mbasti@redhat.com>